[zeromq-dev] Does ZeroMQ detect and optimize duplicate connections?

Martin Sustrik sustrik at 250bpm.com
Tue May 24 08:57:46 CEST 2011

Hi Nathan,

> If I make connections to the same host/port from two different threads
> in the same process off the same ZeroMQ context, will ZeroMQ detect
> this? I'm wondering if it will automatically optimize things by only
> making one underlying connection to the target.

No. Merging multiple on a single TCP connection blocks all the feeds 
when one feed starts applying backpressure (say HWM is reached on 
receiving side). Not a good idea.

> Otherwise, what are the implications, performance and otherwise, of
> ZeroMQ connections?

Exactly the same as those of the underlying transport (TCP in this case).


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